JPH03228539A - Safety device for reprocating feeding mechanism - Google Patents

Abstract

PURPOSE:To eliminate wiring in a table sliding area to prevent deterioration of wiring by providing a table sladably against a guide, and converting the driving force of that table to the rotating force, and detecting a runaway of the table with that rotating force. CONSTITUTION:A toothed pulley 14 is engaged against a toothed timing belt 23 for driving a feeding mechanism of a table to convert that driving force to the rotating force. The toothed pulley 14 and a small flat gear 15 are installed to a shaft 12 integrally, and furthermore, a large flat gear 18 to be engaged with the small flat gear 15 is provided in a shaft 13. A disc member 19 having the shaft 13 in common with the large flat gear 12 is arranged, and discs 20, 21 having the shaft 13 in common are arranged on the disc member 19 in order. A projection is formed in the periphery of each disc member 19 and discs 20, 21 so that a phase thereof is dislocated from each other, and a switch 24 to be turned ON/OFF by these projections is arranged on a plate 11. The switch 24 works to detect an origin and a runaway and a set value respectively to prevent a runaway of the table exceeding the set value.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a positioning safety device for a reciprocating mechanism of an industrial robot, machine tool, etc.

(B) Prior Art Conventionally, there is an example of this type of positioning safety device as shown in FIG. This is because the table 2 is slidable with respect to the feed guide 1, and the dog 3.4 is protruded from the side of the table 2, and this is arranged before and after the positioning switch 5 provided on the side of the machine. Position the detection switch 6.7.

In the figure, 8 is a terminal box, 9 is a wiring cable, and 1o is a movement amount setting point of the table 2.

To explain the operation in this case, the table 2 performs reciprocating motion along the guide 1 by some driving source. When regulating the movement of this table 2, first the dog 3 is moved to the switch 5.
The table 2 is placed at a position where it is to be operated, and an electrical signal is given to the control section so that this position is determined as the origin. Next, the amount of movement of the table 2 is set between the point at which the dog 4 operates the switch 7 and the origin, within a range in which the dog 4 does not operate the switch 7. The table 2 is thereby defined to reciprocate between the origin and the set point 10 that has been set. If, for some reason, the tape does not stop beyond the specified range of movement, the table 2 may deviate from the range of the guide 1, leading to damage to the mechanism.

To prevent this, runaway detection switches 6 and 7 are installed, and if the table 2 does not stop at the origin, the dock 3 operates the switch 6, and if the table 2 does not reach the set point, the dock 3 operates the switch 6, and if the table 2 does not reach the set point The gua 1 operates the switch 7, electrically detects runaway of the table 2, and stops the table.

As shown in 2, conventionally, a part of an object that moves reciprocatingly or a protrusion attached to the object directly operates the swivel notch.

(C) Problems to be Solved by the Invention However, in such a safety device, since the switch 7 is disposed beyond the range of movement of the table 2, a long wiring cable 9 is required.
Requires. For this reason, for example, if there is a high temperature part or an environment where water or oil droplets are scattered in the movement range of the table 2, the wiring cable is likely to be damaged. In addition, the safety device for the mechanism that makes it difficult to set the switch 7, the accuracy of the feed guide 1 is rough, and the positional relationship between the dock 3.4 and the switch 5.6.7 cannot be maintained constant, making it highly reliable. I don't expect a switch function.

(d) Means for Solving the Problems In order to solve these problems, the present invention provides a table that is slidably provided along a guide, a drive mechanism that drives this table, and a drive mechanism that drives this drive mechanism. It has a conversion means for converting force into rotational force, and a detection means for detecting runaway of the table using the rotational force extracted by the conversion means.

(e) There are no wiring or cables along the sliding area of the working table, and there is no longer any deterioration or damage to the wiring due to the presence of high-temperature parts or an environment where water and oil droplets are scattered.

(F) Examples The present invention will be explained below based on the drawings of the examples.

Fig. 1 shows the main part of the safety device of the reciprocating feed mechanism of the present invention, Fig. 2 shows a cross section of the rotation part, Fig. 3 shows the switch operating part, 23 is a toothed timing belt for driving the feed mechanism, and 29 is a toothed timing belt. The attached pulley 14 is engaged.

Here, in order to briefly explain the operation of the embodiment, the following symbols will be defined.

Reciprocating feed (7)7. Trotz...L (However, v1 mechanical movable range) IJff size boob pitch diameter...d.

Pitch diameter of small spur gear...dl Pitch diameter of large spur gear...d2 (here d2≧d1) Setting value for reciprocating feed...ρ (here ρ is set) Swipe for origin detection...S W .

Runaway detection switch...S W 2 Set value comparison switch...S W 3 Conversion ratio Q/'
(τdO)...n Reduction ratio d+/dz...n The shaft 12. is perpendicular to the plate 1/' fixed to the body fixing part.
13 are arranged side by side, and the above-mentioned toothed pulley 14 is attached to the shaft 12.
A small spur gear 15 is connected to this toothed pulley 14 so as to share the shaft 12 at the center, and these toothed pulleys 14
4 and spur gear 15 are free to rotate together about shaft 12 and are restricted from moving axially by members 16,17.

Furthermore, a large spur gear 18 is provided on the shaft 13 so as to mesh with the small spur gear 15, and the shaft 13 is centered on the large spur gear 18.
, one disk-shaped member is sieved so that it has . The large spur gear 18 and one disc-shaped member share a central part with the shafts 1 and 3, and there is a crescent-shaped part between the center hole and the outer periphery so that it can be fixed evenly to an appropriate position in the circumferential direction. Discs 20 and 21 provided with long grooves are arranged. And a disc-shaped member 19 and a disc 20
．． The outer diameters of the disks 21 and 21 are the same, and one protrusion is provided on the outer periphery of each of the disk-shaped members 19 and disks 20 and 21, respectively. Switches are arranged on the plate 11 around the disc-shaped member 19 and the discs 20 and 21 so as to be turned on and off by respective protrusions.

In such a configuration, the toothed pulley 14, the small spur gear 15, and the large spur gear 18 are determined so that n''/n length is 1 for the set value Q, and the protrusions of the discs 20 and 21 are the protrusions of one disc-shaped member. The protrusion of the disc-shaped member 19 turns the switch 0N10FF, and the protrusion of the disc 20.21 turns the switch ON/OFF.
Assuming that the switches that are turned off are SW1 and SW2, the timing of the electrical signals at this time is as shown in FIG. When there is no particular need to detect the set value of the movement amount, S W can be omitted. As another example of this embodiment, if a chain is used instead of a toothed timing belt, a sprocket is used instead of a toothed pulley, and instead of a toothed timing belt, the ranks 26 are juxtaposed in the direction of movement. Then pinion 2 is used instead of toothed pulley.
There is a method of substituting 5. The latter embodiment is shown in FIG. Note that the smaller the value of n, that is, the larger no, the better the positioning resolution becomes.

(g) Effects of the Invention As described above, the safety device of the present invention eliminates wiring and cables along the sliding area of the table, and can provide a compact and highly reliable safety device for a reciprocating mechanism.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the main parts of the safety device of the reciprocating feed mechanism of the present invention, Fig. 2 is a sectional view of the main parts, Fig. 3 is an exploded perspective view of the switch operation part, and Fig. 4 shows the parts of each switch. A timing chart of electric signals, FIG. 5 is a perspective view showing an embodiment of a rack and pinion type feeding mechanism, and FIG. 6 is a perspective view of a safety device of a conventional reciprocating feeding mechanism. 11...Plate material, 12...Shaft, 13...Shaft, 14...
Toothed pulley, 15... small spur gear, 16... bearing,
17... Spacer, 18... Large spur gear, 19...
Disc-shaped member, 20. 21... Disc, 22... Spacer, 23... Toothed timing belt, 24... Switch, 25... Pinion, 26... Rack, 27
...Set screw.

Claims (1)

[Claims] 1) A table that is slidably provided along a guide,
It has a drive mechanism that drives this table, a conversion means that converts the driving force of this drive mechanism into rotational force, and a detection means that detects runaway of the table using the rotational force extracted by this conversion means. Safety device for reciprocating mechanism consisting of